Current Electricity 5 Question 12

12. A rigid container with thermally insulated walls contains a coil of resistance $100 \Omega$, carrying current $1 A$. Change in internal energy after $5 min$ will be

(a) zero

(b) $10 kJ$

(c) $20 kJ$

(d) $30 kJ$

$(2005,2 M)$

Objective Question II (One or more correct option)

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Solution:

  1. $W=0$. Therefore, from first law of thermodynamics,

$$ \Delta U=\Delta Q=i^{2} R t=(1)^{2}(100)(5 \times 60) J=30 kJ . $$

$\therefore$ Correct answer is $(d)$.



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